Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 70757a7c95961e93…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:17 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 8c6a95c2e25f9ba8680de2d77d4e52a8 SHA-1: 86b2aa640bee28d59f3f4d23d278d1c3985260c5 SHA-256: 70757a7c95961e93da09681c0d021a54c8eb7a26e7d7a68c5b89401072c89326
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for executing malicious code upon opening the workbook. The `RUN=0` formula API suggests the macro is designed to execute external commands or scripts, likely leading to further stages of infection.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6674 bytes
SHA-256: 0442f1ebdefef519c36c4a9f9ae9825c39b35c53229d47cf31b8559629895186
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JUNaztSmSr
' 0018     27 LABEL : Cell Value, String Constant - ArdZYeumIvCC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F143 
' 0018     20 LABEL : Cell Value, String Constant - cqWVU len=0 
' 0018     26 LABEL : Cell Value, String Constant - dgBbCJVxTfm len=0 
' 0018     26 LABEL : Cell Value, String Constant - DWDFjREMFtH len=0 
' 0018     26 LABEL : Cell Value, String Constant - ewVwoSxTUYC len=0 
' 0018     25 LABEL : Cell Value, String Constant - GIeLCZwWBt len=0 
' 0018     22 LABEL : Cell Value, String Constant - hSEoeYS len=0 
' 0018     22 LABEL : Cell Value, String Constant - kBnzcqu len=0 
' 0018     25 LABEL : Cell Value, String Constant - mJkmAdJVUt len=0 
' 0018     20 LABEL : Cell Value, String Constant - MVrNk len=0 
' 0018     26 LABEL : Cell Value, String Constant - ouzAlnLptdF len=0 
' 0018     24 LABEL : Cell Value, String Constant - PZTNfYXuX len=0 
' 0018     27 LABEL : Cell Value, String Constant - qhAqlTFfPquP len=0 
' 0018     27 LABEL : Cell Value, String Constant - rzjuxWZDhtiU len=0 
' 0018     20 LABEL : Cell Value, String Constant - UwBEo len=0 
' 0018     23 LABEL : Cell Value, String Constant - WNRDjGid len=0 
' 0018     26 LABEL : Cell Value, String Constant - WQoCgLczlwq len=0 
' 0018     23 LABEL : Cell Value, String Constant - wsAcXhIE len=0 
' 0018     24 LABEL : Cell Value, String Constant - xfDtkhYMk len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZSbsMiAt len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant
... (truncated)

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